Yes, it sounds like the board was wet in the past and swelled to its current condition. This does not sound like the previous owner fixed anything so (short of asking him what happened), you're guesses are good - either previous water intrusion, condensation or put away wet. The biggest threat is water intrusion, so you would do well to examine all of the seals on the roof and around the bunk and touch up with Dicor LAP sealant as needed.
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Scott
DW, 3 Kids and our Goldens
2012 Shamrock 233S
2008 Toyota Sequoia 5.7L 4WD
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